MPI_T_PVAR_WRITE(3)

💖 MPI_T_pvar_write 💖

okay bestie, this is the Open MPI manual page for MPI_T_pvar_write, and it's literally the "make the number go" button for performance variables. sit down, hydrate, let's go ✨

MPI_T_pvar_write — write the value of a control variable 🎀

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✨ SYNTAX ✨

🌸 C Syntax

#include <mpi.h>

int MPI_T_pvar_write(MPI_T_pvar_session session, MPI_T_pvar_handle handle, const void *buf)

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💅 INPUT PARAMETERS 💅

• session — performance experiment session. the vibe container 🫶
• handle — performance variable handle. which variable are we touching, bestie 👑
• buf — initial address of the storage location for the variable value. where the new value is chillin' 🍓

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🌈 DESCRIPTION 🌈

so MPI_T_pvar_write attempts to set the value of the performance variable that's identified by the handle you passed in handle, inside the session you passed in session. the value that's getting written lives in buf. 🦋

and this part is on you, not on the library: the caller must make sure that the buffer you gave in buf is large enough to hold the entire value of the performance variable. like, the whole thing. no partial vibes, no overflow, periodt 💀

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😭 ERRORS 😭

MPI_T_pvar_write will fail if:

• MPI_T_ERR_NOT_INITIALIZED — the MPI Tools interface not initialized. you didn't even say hi first 🙈
• MPI_T_ERR_INVALID_HANDLE — the handle is invalid, or it's not associated with the session. wrong handle, wrong room 🎀
• MPI_T_ERR_INVALID_SESSION — the session argument is not a valid session. that session does not exist, bestie 💀
• MPI_T_ERR_PVAR_NO_WRITE — the variable cannot be written. nope, this one's read-only, hands off 🚫

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👀 See also 👀

• MPI_T_pvar_handle_alloc <#mpi-t-pvar-handle-alloc>
• MPI_T_pvar_get_info <#mpi-t-pvar-get-info>
• MPI_T_pvar_session_create <#mpi-t-pvar-session-create>

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🫶 Copyright 🫶

2003-2026, The Open MPI Community

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okay that's the whole page, you ate it 💅 huge love to The Open MPI Community for the copyright spanning 2003-2026, and this lil masterpiece is dated Sep 10, 2026 — from the MPI_T_PVAR_WRITE(3) page in the Open MPI manual. go write those performance variables, main character 🌟💖